Air-brake.



PAIIENTBD JAN. 22, 1907.

n. n.' wnsrmcnous. Am mmm. AII'LIQTIOI FILED APR, IEDM Voir is 'in a short time so far reduced as to be ioiiipara a short and also for t e purpose of facilitat- UNITED STATE spseiamioa einem raient.

ramas im. sa, 19o?.

Applicaties lletl April 16,1904. Serial No. 203,407.

.Tn all whom il may concern:

Bo it known tlmt. l, llrzxur Il. Wizsrmo-A I novas, ii citizen of the ,United Sintra. residing in New i'ork city. ponnty and Stute of New York, have invented n certain new und Y useful improvement-in .\rllral:e-. ol' which the following is' it specification.

'lliis invention relates in general to nirorakcs for rail\\'iiytsars, and more particularl'v to the automatic air-brake system in l which each car is provided with a train-pi ie. auxiliary reservoir, triple valve, and bra ecylinder, the triple valve being operated by i reductions in train-pipe pressure for supplyi ing air from the auxiliary reservoir to tne brake-cylinder.

With the present standard equipnmnt in the operation of trains down long rudes, where it is necessary to hold the bra es api plied for comparatively long periods of time, it also becomes necessary to make further and successive reductions in train-pipe presI sureforthe pur of replenishngthelirakeg 2 linder from t e auxiliary reservoir in order lo compensate for the leakage therefrom. In this way the pressure in the auxiliary reserinelYectual. Also whenever a full-service I i cation be inade--tliat is, one in which f auxiliary-reservoir pressure is equalized with that of' the brakec 'linder--any further leakage draws from bot the brakecylinder ind auxiliary reservoir, and thereby diminahes the vbraking pressure. 'With some :qui ments where alacktake-up devices are 'imp oyed the auxiliary reservoir is made of tively small capacitv,.`zn order to se :ure the desired brake-cvlinder pressure corresponding to certain notons-in train-pipe brossura where the t el of the brake-piston the release, and when a full-service ap- 5 plicatior'i islniade itwill readily be seen that i :he brakin -pressurcmay he rapidly diminslied by veakage from the brake-cylinder )wing to the small capacity of the auxiliary `nervoii It is therefore desirable to rol.'ide some. means for reinforcin or rep en :hing the auxiliary reservoir an n brake-cylg struction. i, additional source of air-pressure, such asa supplemental storage reservoir 7, which may bc charged in any desired manner and proor when the auxiliary reservoir pressure has been reduced n certain amount in order that the luakiuppresnure nniy lic maintained sul stantinlly at that point for a considerable period of time, and this constitutes the. main oh'vot ol' my invention.

alf. iinrntion therefore comprises means for reinforcing. or supplying air to the auxilia ry reservoir from un additional source, such as a supplemental or storage reservoir, when the'pressnre in thel auxiliary reservoir is ref duced a predetermined amount, or substanl inder in full-service npplicntionaofthc'brnlres 5o tiallv to the erpializin point, iis in n fullservico application of t ie brakes.

y .ln the accompanying drawings, Figure 1 shows diugrainniatically n car equipment of i un autoinatic-air-brake apparatus with one forni of ni f improvement applied thereto, and Fig. 2.a io'ws a modification. The trani-pipo l is provided with a branch i pipe 2, leading to the triple valve 3,-whicli is connected to thebralm-cylinder 4 and by pi )e 5 to the auxiliary reservoir 6, ull of w iiclif'may lie of the ordinary standard conln addition thereto l provide an vided with means for reinforcing the auxiliary reservoir when the pressure therein is reduced shown in Fig. l, the supplemental reservoir is charged tlirou lia reducing or excesspressurevalve 8, w iich may be located in a pas sag'e or pipe 0, leading [rom the auxiliary reaervoir to the sup lcniental reservoir, the valve having an ad justable load device, suc-li as a spring 10, which may be set to give any desired difference between the pressures of the auxiliary reservoir and the supplemental reservoir when the same are both e normal maximum pressure. The supplemental reservoir also communicates with the auxilia reservoir through a separate pipe connection 1l, containing check-valve 12, which 'a predetermined amount below normal. As

opens toward the auxiliary reservoir to perfis Considcrin the supplemental reservoir and have noellect in the urdinary operation of the brakes. When, however, a fiill-service application is inadc in which the auxiliary-reservoir pres' sure equalizes with the brake-cylinder at a pressure below lifiy pounds, or if for any other reason the pressure in the auxiliary reservoir is reduced belowt hat stored in the sup;

pleziiental reservoir, air will then llow from train-pipe, auxiliaryl reservoir, triple valve,

the supplcincntal'rescrvoir ythrough thc checkvalve to the auxiliary reservoir and reinforce the saine to' the extent of the capacity of the supplemental reservoir, so that any further leakage which draws from the auxiliaryreservoir will also 'draw from the supplemental reservoir, which constitutes practically an enlargement of the auxiliary reservoirfor all pressures below 'that stored iii said sii plcmental reservoir. As tlic capacity -o the supplemental reservoir may be inadeanything desired, it will be seen that an ordinary brake-cylinder leak would not be sullicient to reduce the pressure of the combined capacities of the auxiliary reservoir and supplemental reservoir except-at a very slow raie, so lthat an elliciciit braking-pressure would be maintained in thc brake-cylinder for a coinparatively long period ot time or until it should'be desired to release the sazn'e.

According tothe modification shown in Fig. 2 tlie=supplenicntal reservoir is charged .to thc same standard normal pressure its the auxiliary reservoir, and a pressore-reilucingvvalve device 13 is inserted in the pipe or pas-- 5 N3 c leading tro'in thc supplemental reservoirto the auxiliary-reservoir, thc reducingvvalve device having a diaphragm l5 subject to the'auxiliary-reservoir pressure, und un op )usingV spring 16 adjusted to allow the va vc 14 to close at all pressures above ii prcdcteriniiicd ainouiit,'such as lil' ty pounds per square inch, to prevent flow from the supplyinental reservoir to thc auxiliary reservoir, but adapted to open when the auxiliaryrcservoir pressure is reduced bclow 'this amount, und thereby maintain thc auxiliaryreservoir and brake-cylinder pressure at su 'istant'ially this point. As shown in thi inodilicaticn, the supplemental reservoir is charged from the auxiliary reservoir'by thev air raising the valve 14, which acta as a check-valve and permits the air to llcwfrom. thc auxiliary reservoir tc the sulpplemental reservoir, thereby dis using wit any addi. tional connections. t will also' be evident that in the construction shown in Fig. 2 the. supplemental reservoir or supply-chamber inav bc cha in any convenient manner, and to any ehcr degree of pressureV that inaybedcsir. ,l u

lt will now be apparent that by means of inv improvement t ie undesirable depletion of the braking power-after full-service or successive applications may be prevented and a sufficient volume of air under pressure `will always be at hand to safely control the speed ofthe car or train.

Having now described my invention, what I claim as new, and desire to secure by laetl ters Patent, is-v l. In an air-brake, the combination with a and brake-cylinder, of an additional source of pressure, and means operated by a reduc- 4 of pressure, such as a supplemental reservoir,

and means for supplying air from the-supplemental reservoir to the auxiliary reservoir when the pressure in the latter -is rediicedfto substantially the,equalizing-point.A 3; .In an air-brake, the combination train-pi e, auxiliary reservoir, triple v'atye' and bra e-cylinder, of a supplemental raser-g' voir, means for charging t. esame to a degrec of pressure substantiall equal to thev normal pressure of the auxi iary and means for establishing communication from tlicsuppleinciital reservoir to thel auxilarv reservoir when the pressure in the latter liills toa predetcrniinedpoint. t v

4. ln an air-brake, the combination with a. 1min-pi n, auxiliary renewoir, triple valve land bra e-cylinder, of a supplemental reservoir, a passage for supplyin r ai f lo the saine, und n valve/device operate( by a reduction` in the auxiliary-reservoir pressure-to slibstantially the e iializing-point, for opening communication roni thc supplemental reservoir to the auxiliary reservoir.

5 ln an air-brake, thc combination with a ieg of pressure, such as a supplemental reservoir vii. passage leading from the supplement yont 5l .6. In an air-brake, the eombinatm with a auxiliary reaervoir, triple valve linder, of a voir, means 16;. pana from plem'ental merl'rom the auxilreservoir the supplemental and a r0- relervoir to the auxiliary reaervoir and a rowing-valve device having a diaphragm vom b the au'xiIlary-renewal#I premura oreontrolhng said ass e. In testimony whereof have hereunto nel. 15

my han HENRY Il. 'lb'llNUllOUSl'. tmwea:

. F. Emmi',

JM. B. Mwlumw. 

